The Prisoner S01E09 - Checkmate

Number Six takes the position of Queen's Pawn in a human game of chess. An illegal move by the Rook leads to his withdrawal and he is taken to The Village hospital. Number Two brainwashes the Queen to fall in love with Number Six who discovers the locket the Queen wears around her neck is in fact a radio transmitter to track him. The transmitter is useful to Number Six and he manages to borrow the locket which he intends to use with the Rook in his latest escape bid.